This question discusses differences between positive and negative prophecy. The mentioned idea states that, while positive prophecy will always occur, negative prophecy may be negated by repentance. An answer there cites verses from Jeremiah 28 that seem to imply this idea. In fact, Maimonides in Laws of principles of Torah 10:8 (aka 10:4) states this explicitly.
Lehem Mishnah on Maimonides' law cites the Talmud on Shabbos 55b that discusses an exception to the endurance of positive prophecy, so I am wondering if Maimonides' stance is absolute? Is it sourced somewhere in the Talmud explicitly? Are there any other opinions about this matter? Any other interpretations of the verse in Jeremiah?