The count to Pentecost should not be any different in those years when Passover falls on the weekly Sabbath — the same instructions apply.
How does one count to Pentecost when Passover falls on a weekly Sabbath? If we are consistent and honest with the Scriptures, the solution is clear.
Because Pentecost does not have a specific date, God commands us to count from the day after the weekly Sabbath falling within the Days of Unleavened Bread.
If Israel had offered a foreigner's grain, it would have violated Leviticus 22:25. The conditions for a wave sheaf offering were not right until Joshua 22.
Joshua 5 makes no mention of a harvest, an altar, a priest, the waving of the sheaf, or the offerings God commanded to accompany the waving of the sheaf.
Confusion over time of Passover, the wavesheaf offering, and Pentecost results from making assumptions unwarranted by clear scriptural evidence.
How does one count to Pentecost when Passover is on a weekly Sabbath, making the Last Day of Unleavened Bread the only other available Sabbath to begin the count?
Being careless with something we deem minor can be fatal. We are to live by every word God gives to us, kept pure, unadulterated by additions and subtractions.
The wavesheaf offering is reckoned from the weekly Sabbath within the Days of Unleavened Bread. It had specific requirements that were not met in Joshua 5.