Yes. This is probably a resulting issue.
Here is the video of me in action.
https://youtu.be/R2_1Qcq7qHI
The issues are similar, but they are not the same. I am going to post a video clip if I can of a situation where it does not allow me to place kelp in source blocks.
CORRECTION! It is going to have to be on youtube since the file size exceeds 10 MB. It will be unlisted so that only people with the link will view it.
I got the same bug as well. What I did was reloaded the world in the 1.14.1 release, and it let me get out of it just fine.