1RB2LA0LA_2LC---2RA_0RA2RC1LC
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1RB2LA0LA_2LC---2RA_0RA2RC1LC (bbch) is a non-halting BB(3,3) TM. It is listed as "unofficial holdout ID 494" in Justin Blanchard's 3x3 "mugshots" holdout list, which can be found at File:Mugshots small.pdf.
On July 22, 2024, busycoq received a proof that this TM doesn't halt: https://github.com/meithecatte/busycoq/commit/ce2f22e1616632924622016d9cbb8ba0847b2c6a