The bug
If you copy a Sign with the State "lit: true" with Ctrl + Middle Click on your Mouse and place it again, it doesn't save the "lit"-State.
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[media]

can confirm and reproduce

can confirm

Can confirm and reproduce
Can confirm in 21w05a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w07a.

Relates to MC-48453.