shortcode_parse_atts() no longer parses embedded html fragments

[Magenta Cuda]

I have a shortcode:

[show_custom_field field="image_media" before="<img src='" after="'>"]

Previously, shortcode_parse_atts() would accept the attribute:

before="<img src='"

But, now shortcode_parse_atts() rejects any attributes that have unclosed HTML elements.

I have almost three years invested (10K lines of code) in this plugin and I really would like to keep it functional. That being said it is also true that I am no longer actively developing it and it has only 30 users.