Sometimes the PlantUML images cannot be display based on different (online) problems and only a broken image is displayed like below

and the image cannot be opened in the PlantUML server too based on missing links.

Therefore all image links should be harmonized with following regex-replacements that
a) all images are extended with a PlantUML server link
b) all are displayed as svg
c) alternative/broken image link text is extended with "- open link"
d) tooltip is updated with alternative image text

search: (?<!\[)!\[(?'title'.*)\]\((?'url'https:\/\/www\.plantuml\.com\/plantuml)\/(png|svg)\/(?'base64'[^) ]+)( \"[^\"]*\")?\)
replace: [![${title} - open link](${url}/svg/${base64} "${title}")](${url}/uml/${base64})

after the changes a not working image looks like below and the link opens the image source in in the PlantUML server