A humble brag is still a brag, just wearing a disguise. Either own it or let the work speak.

Wrapping good news in a complaint fools almost nobody and makes the moment awkward for everyone in it. The dressing up usually comes from wanting credit and not wanting to look like you want credit. Saying it plainly and saying nothing are both cleaner than the version in between.

When something goes well, try one flat sentence with no apology attached to it. If that feels like too much, say nothing and let people find out. The middle option is the only one that costs you anything.