Use the shelf limits and arrangement specified for the model rather than judging by appearance alone. A heavy container concentrated in one spot creates a different situation from several lighter items spread safely across a shelf.
What the observation tells you
A shelf that is not fully seated can be unsafe even when the total load seems modest. Cracks, chipped edges, damaged supports or a missing trim are reasons to stop using that shelf until suitability is assessed. Do not test the remaining strength by pressing on it or placing an extra heavy item there.
A useful next step
Move heavy contents carefully to an appropriate safe position, check that the correct shelf is in the correct supports and consult the manual for any stated load limits. Obtain a model-matched replacement for damaged fittings. An approximate width alone does not establish that a replacement shelf has the required support or strength.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.