Can’t reproduce. This might be due to reloading while holding shift or just a keyboard/windows issue. But maybe the steps to reproduce are important.
The Firefly Bush does not have a blockstate for day/night, so it’s not a bug.
You should rather post this on the feedback page: https://feedback.minecraft.net/hc/en-us
This is the Java Edition portal. Bedrock Edition bugs go here: https://report.bugs.mojang.com/servicedesk/customer/portal/6