Its worn out, common problem as the shoe eats away at the alloy drum making it thin & then it fails.
As you will know the part is no longer available (obsolete) so you have three choices.
1. Is to find another used one, XT550J, XT600Z 34L, XT600 43F any of the rear brake shoe ones will fit, but they could all be worn out as well (easiest option)
2. Change your whole rear end to disk brake (better in the long run) but costly.
3. Have it welded up & machined out (expensive solution)
Mezo.
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