I had accidentally replaced these by mon->can_see_invisible(), causing for instance stealth checks to hardly ever fail.
QFZ3XU7QSF3ZHGNM2BS2M5UHVQYIDBABHVUJUJDLJPY4UHMUOGVAC
RKBYUVD6HHZZ6GIEELNTOEWAQ2P3C2IMQSRH4XFVLCDZZHKNGJ4AC
YL3F5FHSLFL3ADBOGXSJZT6LMPJR5EW3RL3JA5TAFF4GDB546T5AC
K2CS6TCX2NDVL2ASEHGP4J4K4IJ6FP3ANNKTSIWVG43HPYSBX6ZQC
YMUDD3TCTXZ3U4W3AMKNCPO2K5VTOTSXSV34T36NIWMVDJXWA6TAC
WT66JDIRTLLP37SHTV4GI3V64JFJ4D25LNRLGCHFG6CLEFKJ3QGQC
5WVUTEZLEZEML54CKPR6GACQBYY3EMVNXMLJOREN6SSEUZGC47AQC
2O3C3MTT2ZBYIFGPJ4MF5R4AXBYUHOEN62KAUWFWF6JWHIIVLRNQC
7PRZJ6KZLG26YVTAMXT7YOTQLWZHGWGRTKXZZ52P4XYCQD4GT5WQC
YFIVTYI7PMVAXV23DUPXPAQNEY3YSFIXQGSN32I3WVHMMD5XS5DQC
SIDH2P7NBIG5KEOE27XHD3ZT2NQ2OJZFN6VZXWNWYFFY5YVXSSVQC
FYSQ7HXDIKXZXDGYVKZMODW7HYQQLRZO52Q2HVM3PYBD37UT5B4AC
TGJZXTUIAKCFZQJ54ZQEBGFBVZSJCAX6AWDRSH3TP7UJRLGUM5SAC
2E4RV454MTTCKYLKMSHEEAFPNAFVUXXPBZV3XP6V7QMF4BBWE7TAC
CGYTZT5QWIEGYKUOLOK7MFXSLJKLYRZONER5ZCDZO5XYWSLG475QC