Some special characters e.g. "%" in links are encoded multiple times (every time a document is saved using the "Update"-button) leading to invalid URLs!
Example: Add "https://www.symptoma.com/en/search?query=cough%2Cfever " to a hugo note and save the document. The link is changed to "https://www.symptoma.com/en/search?query=cough%252Cfever" which is not valid any more!