The text in the debug mode / output window is not using the full window and the timestamp, class and thread have messed up text colors
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duplicates 1
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This is already being tracked as MCL-17432 and MCL-17433. They are fixed in the current beta version! To enable the beta version of the launcher, select the Settings button in the bottom left corner of the launcher, and check the first box. Then, restart your launcher, and your log should be fixed! Alternatively, if you don't want to enable the beta version, you can wait for the main release.
This will be fixed in next release