When you place blocks inside of an end portal, then light the portal, the blocks get deleted. They don't even drop anything, so the block is gone forever.
What I expected to happen was:
The blocks will drop when the end portal opens
What actually happened was:
The blocks get deleted and don't drop anything
Steps to reproduce:
Build an end portal but don't put in the eyes
Place blocks in the middle of the end portal
Put in the eyes; the blocks will get deleted
Go through the portal
Notice that the blocks got deleted, but they did not drop anything
Fix suggestions:
Easy fix: Make it so the blocks drop when destroyed by the end portal
Hard fix: Make it so the portal will not open until there is nothing in the way
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This is a invallid post for the reasons that Dylan Peterson says.
I meant to set it to true in the video, to prove that it is on, but I accidentally set it to false instead, and I didn't notice.
I have attached a new video, to not have the attached video contradict the bug report

Can confirm.

Can confirm in 21w37a.
Can confirm in 1.18.1.
Relates to MC-95910
Can confirm in 1.19.1.
Can confirm in 1.19.2.

Still affects 1.21 pre-release 1, despite this version fixing MC-902.

This appears to be fixed in 25w03a. Can someone verify that this is the fix version?

According to https://cdn.skye.lol/diffs/25w02a_to_25w03a.html this was indeed fixed in 3a.
In the video it says in the command log doTilesDrops is set to false which means blocks will not drop itself. Therefor this is an intended game mechanic.