The bug
Selecting multiple buttons in command block and structure block.
How to reproduce
Place a command block
Enter a space instead of a command to no longer have auto completion
Left click on a button and hold it
Press Tab then release your left click
Repeat for each button
Example
Here is an example in video:
[media]Linked issues
relates to 1
Attachments
Comments 16
Confirmed for 1.14 pre-3, 1.14 pre-4 and 1.14 pre-5
New steps to reproduce (much simpler):
Place a command block
Enter a space instead of a command to no longer have auto completion
Left click on a button and hold it
Press Tab then release your left click
Repeat for each button
Here is a video as example:
[media]
Can confirm. Also affects structure blocks.