Motion tile not working

Hi, I have ae 2020. Despite applying motion tile on both clips (one the precomposed transition, one the adjustment layer with s_blurmocurves), there still isn't any mirroring in the clip- so it just disappears into the abyss when made smaller. I have tried to research this but found no solution or explanation. On other clips motion tile seems to be working fine. Even adding motion tile to the precomp isn't working, which is baffling to me. I would greatly appreciate it if anyone could help.