When you use pick block on a sign, and place it again,
then all of the lines in the sign which are blank, are filled in
with the text "null". This also happens when you clone a sign
to another place, then the new sign will also have the bug.
Same happens for all of the signs in the whole world, when you rejoin the world.
I don't know if this matters, but all of the signs were placed
with /setblock.
In the attachments you can see a picture of the bug.
The lines with "null" were blank before this bug.
Linked issues
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Comments
I haven't commented on MC-88026.
Let me rephrase: Please leave a comment on MC-88026 where you give the command you used.
Anyway, the other ticket is resolved now so it's all good.
Please provide the command you used in a comment on MC-88026.