There isn’t a simple built-in selective undo for this once the changes are no longer in Lightroom’s undo history. The safest fix is to restore an earlier catalog backup and then reapply any wanted later edits.

If no usable backup exists, some users have successfully edited Lightroom’s catalog database directly to remove the most recent Develop changes for a specific group of images. A common approach is to first put the affected photos into a dedicated collection, then use catalog/SQL instructions targeted only at that set.

However, this is an advanced, unsupported workaround and carries real risk of damaging the catalog. Back up the catalog before attempting anything. Also, crop changes are especially tricky because they may overwrite earlier crop states, so they’re not as easy to “compensate” for as exposure adjustments.

In short: restore from backup if possible; otherwise, careful catalog database editing may help, but only with a full backup and only if you’re comfortable with that level of risk.