it's very easy to break naturally generated end portals, bedrock and end portals should be impossible to break no matter what. it isn't ideal with the new update that adds many, many end portals to the worlds to worldguard protect them or other ways
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Seems like a visual glitch only.
sorry that video and method is old, i will try to find or make instructions how to break bedrock/end portal tiles and frames
I was under the impression that they were still unbreakable by players in survival mode?
They have always been breakable by players in creative mode.
it's through some bug/exploit with pistons, or water, there are several methods apparently. i'll post proper instructions soon
https://www.youtube.com/watch?v=OPalxq9edqE
this is one of the ways, this still works
don't even need stone, just a bucket of water placed right at the edge of the inward side of the portal block
This bug is all the way from vanilla: https://bugs.mojang.com/browse/MC-11944
It's an old one (affects all versions between 1.5 up to and including 1.11) and has not been resolved yet. It's absolutely game-breaking and prevents people from accessing the end, should the end portals get griefed by someone with a lava bucket or a water bucket.
Also related to https://bugs.mojang.com/browse/MC-8220.
well, this is not completely vanilla. get the plugin multi verse, go to the end by /mvtp world_the_end then create an end spawn, protect it with world guard, add a warp with essentials and there.
While the first link @sudofox posted is now broken, the issue still exists (1.13.1).
Fixed
not fixed, example 1.12.2 i can broke ender portal with water (paper build 1618)
1.12.2 wasn't supported for years. No updates will come out for it
Please use supported versions - 1.15.2 or 1.16.3
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well, this is not completely vanilla. get the plugin multi verse, go to the end by /mvtp world_the_end then create an end spawn, protect it with world guard, add a warp with essentials and there.