I heard the same.
https://www.space.com/james-webb-space-telescope-micrometeoroid-damage
When Webb's mission began, the affected C3 segment had a wavefront error of 56 nanometers rms (root mean square), which was in line with the 17 other mirror portions.
Post-impact, however, the error increased to 258 nm rms, but realignments to the mirror segments as a whole reduced the overall impact to just 59 nm rms. For the time being, the team wrote Webb's alignment is well within performance limits, as the realigned mirror segments are “about 5-10 nm rms above the previous best wavefront error rms values.”
For now, engineers are keeping an eye on potential future dust-generating events such as in 2023 and 2024, when Webb is expected to fly through particles left behind by Halley's Comet, according to Nature (opens in new tab).