The affix ṭhañ (+\/- -- ika) comes in the sense of 'being fallen into this or thrown into it' after the word saṃśaya in the Accusative -2nd case in construction.,
Thus संशयमापन्नः प्राप्तः = सांशयिकः स्थाष्टः \a doubtful pillar\, i.e. in a precarious state.,