Yes, the problem with Tape Emulator's Noise level (including the 60Hz hum emulation) getting continuously higher over time has been acknowledged and referred to the third-party plugin developer. In the mean time, don't use the plugin or replace the instance and keep the Noise level at 0 (I think that should avoid it, but haven't actually tried it).
EDIT: Oops. Cross-posted. So this
is fixed in X3c, but might require a re-scan?