While not critical, this use of a space is not only a problem for parsing, it also makes Logback look unprofessional (amateurish) to sysadmins and developers reading these logs.

-~~| Suggestion |~~----

If the developers want to avoid changing current behavior, I suggest a new tag. Leave this in place as-is:
%date

{ISO8601}

Create this tag which strictly follows ISO 8601 to include the 'T':
%date

{ISO8601Strict}

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