Getting "Unknown type: undefined" error

Firstly, this is the second time I get this error whenever I'm adding content in a lesson and it doesn't let me delete or edit any new block that I add.

Secondly, any new block added goes all the way up in the lesson instead of going to the last place as it should be. The way I solve it is doing the lesson again from scratch.

There's a screenshot attached with the message error.

I'd appreciate any help, thanks.

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