Basically what the title says. If you first place a redstone block down and then a command block next to it (doesn't matter which type), change it to repeating and enter a command (such as: say hi!) it doesn't give output unless updated, either before or after the command was entered.
Feels related to MC-86846 and possibly MC-149038, not sure about that one.
Also was able to reproduce in 12.2, 13.2, 14.4, but this behaviour may then also have been produced by MC-86846 in the case where the command block was powered and on 'needs redstone' mode.
Easily read reproduction steps:
place down redstone block
place command block next to it
set mode to repeating and enter any command (e.g. say hi)
no output
update command block (placing block next to it, breaking a block, (soft) powering it with redstone (again), etc.)
output starts
Linked issues
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