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There was already a bug report - https://bugs.dolphin-emu.org/issues/13416. Furthermore, the Libretro port is not maintained by the Dolphin team, so your report will probably be closed/forwarded to the libretro repository.
You could try enabling manual texture sampling but make sure to use opemGl or else it wont work. That's how i solved it for resident evil 4 and MKDD