Thanks for pointing out in your 5/18 post Shavuot verses Pentecost. that the wheat for the 2 loaves of leavened bread for the wave offering at Shavuot (Feast of Weeks, which was held on the 50th day after the Feast of First Fruits offering of a sheaf of barley) had to be made out of wheat that the Israelites planted and harvested themselves according to Exodus 23:16, "And the feast of harvest, the firstfruits of thy labours, which thou hast sown in the field: and the feast of ingathering, which is in the end of the year, when thou hast gathered in thy labours out of the field." 

The Israelites crossed the Jordan westward into Canaan (Israel) on the 10th day of the 1st month called Abib or Nisan according to Joshua 4:19, and they held their Feast of Passover in the Spring on the eve of the 14th day of the month (Nisan 14) according to Joshua 5:10, Leviticus 23:5 & Numbers 9:1-5.  Since both barley and wheat are planted in the autumn, those Israelites living on the west side of the Jordan had no barley sheaf offering for the Feast of First Fruits on Nisan 16, and they had no wheat for the 2 loaves of leavened bread for the wave offering at the Feast of Weeks on the 50th day after the Feast of First Fruits barley sheaf offering on Nisan 16.  So those Israelites living westward of the Jordan didn't celebrate either of these 2 feasts after the Feast of the Passover the first year that they were living there. They would have to wait to plant barley and wheat in the autumn in the fall before celebrating these two feasts next year after their Spring Passover.  Barley was harvested in March to April and wheat was harvested from the end of April to the end of May. Even if they had planted wheat in the Spring of the 1st year to be harvested later in the year, there was no barley planted in the Spring of their 1st year there because it was only planted in the autumn. Therefore, there would be no countdown from a First Fruits offering of a barley sheaf later in the year to another Feast of Weeks. Both of these feasts were tied together, and the Feast of Weeks wasn't celebrated without the Feast of First Fruits taking place first after the Passover and Feast of Unleavened Bread. 

The Feast of Weeks is also called Pentecost and Shavuot.  There is no scripture in the Bible that told them to celebrate the New Wine festival or present 2 loaves of leavened bread 50 days after the Feast of Weeks.  The New Wine Festival 50 days after the Feast of Weeks was a practice of the Essenes in Qumran.

Deut. 16:9-10, "Seven weeks shalt thou number unto thee: begin to number the seven weeks from such time as thou beginnest to put the sickle to the corn. And thou shalt keep the feast of weeks unto the LORD thy God with a tribute of a freewill offering of thine hand, which thou shalt give unto the LORD thy God, according as the LORD thy God hath blessed thee:" The corn in this verse meant "standing grain" according to H7054 - qāmâ - Strong's Hebrew Lexicon (kjv) which at this time was the barley.

The male Israelites were to keep 3 feasts during the year at which time all the males were to present themselves to the Lord. The 3 feasts were the Feast of Unleavened Bread on Nisan 15, 50 days afterwards at the Feast of Weeks for the wheat harvest with the offering of the two loaves of leavened bread, and the Feast of the Ingathering on Tishri 15 which was also called the Feast of Tabernacles or Booths as shown in the verses below:

Deuteronomy 16:16-17, "Three times in a year shall all thy males appear before the LORD thy God in the place which he shall choose; in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles: and they shall not appear before the LORD empty: Every man shall give as he is able, according to the blessing of the Lord thy God which he hath given thee."

Exodus 23:14-17, "Three times thou shalt keep a feast unto me in the year. Thou shalt keep the feast of unleavened bread: (thou shalt eat unleavened bread seven days, as I commanded thee, in the time appointed of the month Abib; for in it thou camest out from Egypt: and none shall appear before me empty:) And the feast of harvest, the firstfruits of thy labours, which thou hast sown in the field: and the feast of ingathering, which is in the end of the year, when thou hast gathered in thy labours out of the field. Three times in the year all

thy males shall appear before the Lord GOD."

Exodus 34:18, "The feast of unleavened bread shalt thou keep. Seven days thou shalt eat unleavened bread, as I commanded thee, in the time of the month Abib: for in the month Abib thou camest out from Egypt."

Exodus 34:22-23, "And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year's end.  Thrice in the year shall all your men children appear before the Lord GOD, the God of Israel."  

There is no scripture in the Old Testament in which the Lord God commanded the Israelites to make an offering of 2 loaves of leavened wheat bread 100 days after the First Fruits offering of a sheaf of barley, and there was no second crop of barley that was planted and harvested after Spring. Therefore, there was no First Fruits offering of a sheaf of barley in the year that the Israelites entered Israel westward from the Jordan and there was no two loaves of leavened wheat bread to offer 50 days after that for a Feast of Weeks celebration so the Feast of Weeks did not take place in the first year either.  

Pentecost does not take place 50 days after the Feast of Weeks. Shavuot and Pentecost are another name for the Feast of Weeks. Leviticus 23:9-17 also discusses the First Fruit offering of a sheaf of barley and the counting of 50 days afterwards in which the two loaves of leavened bread are presented for a wave offering.

The Eve of Pentecost  on Sivan 5 (Shavuot) on the Jewish calendar for 2025 takes place on June 1, and Pentecost on Sivan 6 (Shavuot) itself takes place on June 2 according to the their lunar calendar at Jewish Calendar 2025 Diaspora - Hebcal  According to the Essene's Dead Sea Calendar, Pentecost in 2025 takes place on Sivan 15 which is June 1st at this link at Essene Calendar and Pentecost would take place on the same day of their calendar every year. The count to their New Wine celebration began on Pentecost and took place on the 50th day after that.