If you look at an end portal through Glass, Water, Nether portals, slime, and honey, the End portals will began to flash.
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Also blink through honey blocks, slime blocks, and barriers are not displayed at all.

To add to this:
In the changelogs of the released 1.16.210 update the following was stated
"Entities that use material state "Blending" now render correctly behind transparent parts"
According to the changelog this bug was fixed. It did fix end portal tiles rendering wrong on the inside of a glass block, however it isn't fixed for the edges, see
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To show the difference with the last released update, I'll also upload this video to see the difference better:
[media]
So to conclude: This bug still exist, even after the tweaking that has been done in 1.16.210
Hopefully this will provide more information

I have video that involves end gateway. I uploaded it. Don't question how I got any of the other illegal blocks, just ignore it.

This also happens for transparent blocks behind the end portal. Additionally there is a visual "wall" on (sub)chunk borders where flickering doesn't occur.

affects 1.17.10.20

affects 1.17.10

I encountered this issue when the water block is underneath it. In 1.17.0

Affects 1.17.10/11 Hotfix

Still here kinda, only it is the other way around in 1.17.40

Affects 1.18.1

Affects 1.18.31

Affects 1.19.22

This also affects 1.19.73

this also applies to end gateways, not just end portals

this also applies to 1.19.80

Affects 1.19.81 (not a big surprise)

This bug has been fixed in the newest beta / preview: 1.20.20.20.

Confirmed in 1.21.44

@unknown: I cannot reproduce this. Please attach a video of the issue occurring.

View the end portal through glass block in bedrock edition.

As previously requested, please attach a video of the issue. Please also attach videos of MCPE-94727 and MCPE-135279 and a screenshot of MCPE-63460.
Thank you for your report!
However, this issue has been closed as Cannot Reproduce.
We were unable to reproduce the issue. If you would like to add more information please do so, or file a new ticket if needed.
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