Some escaped characters are presisting

"extra_attributes": "{\"dbh\":\"10\",\"abs_step_count\":\"10\",\"delta_step_count\":\"10\",\"rotation_matrix\":\"[12,12,12]\"}",

This fix and all extra attributes support can wait for M2.2

Start by locating where the extra_attributes value is produced and handled in the Android app, using the escaped example in the issue as the reproduction case. Confirm how escaped characters persist and clarify the intended M2.2 scope; the issue is done when the expected extra-attributes representation is agreed and the reported escaping problem is addressed.

Written by the indexing model from the issue text.