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The same for me, Chrome Version 90.0.4430.93 (Official Build) (64-bit), issue:
VM30948:8 Uncaught ReferenceError: setEnv is not defined
at new GeocachingMapEnhancements (:8:1)
at :8:19
at :8:116
at insertScript (userscript.html?name=Geocaching%20Map%20Enhancements.user.js&id=deca0041-270e-42c1-ada3-92d5db48fe03:54)
at buildScript (userscript.html?name=Geocaching%20Map%20Enhancements.user.js&id=deca0041-270e-42c1-ada3-92d5db48fe03:52)
at eval (userscript.html?name=Geocaching%20Map%20Enhancements.user.js&id=deca0041-270e-42c1-ada3-92d5db48fe03:88)
at Window.tms_deca0041_270e_42c1_ada3_92d5db48fe03 (userscript.html?name=Geocaching%20Map%20Enhancements.user.js&id=deca0041-270e-42c1-ada3-92d5db48fe03:90)
at :4:80
at eval (userscript.html?name=Geocaching%20Map%20Enhancements.user.js&id=deca0041-270e-42c1-ada3-92d5db48fe03:1)
at eval (userscript.html?name=Geocaching%20Map%20Enhancements.user.js&id=deca0041-270e-42c1-ada3-92d5db48fe03:1)