Brick 0351m025 failed during processing, so doesn't have a Tractor catalog. However the coadds did run to completion for brick 0351m025. We've tried to redact brick 0351m025 from all of the relevant files, but we may not have completely removed it from all possible places in DR5. It could, for instance, still appear in the viewer:
Missing CCDs in the region of Gaia bright stars
Some DECam CCDs that are included in DR3 are not included in the DR5 release. This is because the DR3 zeropoints were based on comparisons to stars from PanSTARRS Data Release 1 (PS1), whereas the DR5 zeropoints are based on comparisons to the subset of PS1 stars that are also in the Gaia Data Release 1 catalog. DR1 of Gaia has "holes" in its coverage, with large spatial regions missing PS1 stars. An example is shown in the figure below, which plots the PS1 calibrators (black dots) and the PS1-Gaia calibrators (blue dots) with the outlines of the DECam CCDs. Since only CCDs with > 20 matched calibrators are retained in the DR5 version of the catalog, CCDs covering regions like CCD N26 in the figure would be dropped from DR5.