The text input window appears with a blue line on the left, and system messages appear with a gray line.
Version 1.19 did not have this. I use Windows 11 21H2.
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Thank you for your report!
However, this issue is Working as Intended.
The report you have submitted is working as intended; this was mentioned in the 1.19.1 Pre-release 2 changelogs:
The trust status of messages are displayed with both a colored indicator and an icon
The colored indicator is always visible
The icon is only visible when the chat screen is open
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
Full Version History – Snapshot Version History – Feature Requests and Suggestions
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That is intentional; they're indicators related to the new chat-reporting feature.