The glyph of the character is too strange, more evidence is needed to prove its form and components. Meanwhile, the evidences couldn't show the meaning and original source.

See #11544

It is almost certainly a variant of 𡴘. The phrase is 幸詳焉, which means "[the author] only hopes [someone] can elaborate" or "to be determined". The collocation 幸詳 appears ~15 time in Taisho Tripitaka, but only once (here) in 一切經音義.