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यस्य विभाषा ONPANINI 72015

Roots that are optionally /aniT before other affixes (are invariably /aniT before /niSThA).

AFI, dhUJ धूञ् is optionally /aniT before several affixes, by svaratisUt.... That makes dhUJ धूञ् compulsorily /aniT before /niSThA —

vidhUtaH विधूतः
vidhUtavAn विधूतवान्
guh गुह् + /kta → **gUDha- गूढॱ
guh गुह् + /ktavatu +/su → gUDhavAn गूढवान्

Also, uditovA makes /udit roots optionally /aniT before /ktvA. This makes the /udit root vRdhu~ वृधुँ (vardhate वर्धते) be compulsorily /aniT before /kta /ktavatu —

vRddhaH वृद्धः
vRddhavAn वृद्धवान्