[3.13] gh-129093: Fix f-string debug text sometimes getting cut off when expression contains `!` (GH-129159) (#129163)

gh-129093: Fix f-string debug text sometimes getting cut off when expression contains `!` (GH-129159)
(cherry picked from commit 767cf708449fbf13826d379ecef64af97d779510)

Co-authored-by: Tomas R <tomas.roun8@gmail.com>