Hi,
I’ve created a wiki page to document to sample mapping issues by Grab / Global Logic at https://wiki.openstreetmap.org/wiki/Grab/Issues. The idea is to categorize issues which can then be used for discussions and so that Grab can provide systematic fixes for them.
We maintain two parts, samples of issues that we publish and another one that we maintain privately to keep track of how well Grab has been implementing fixes.
Updated: changed errors to issues.