The [1928 Convention on Asylum](https://www.refworld.org/docid/3ae6b37923.html) says

> Signed in Havana, February 20, 1928, at the Sixth International Conference of
American States

...

> Article 1.-
It is not permissible for States to grant asylum in **legations**, warships, military
camps or military aircraft, to persons accused or condemned for common crimes,
or to deserters from the army or navy.

> Persons accused of or condemned for **common crimes** taking refuge in any of the
places mentioned in the preceding paragraph, shall be surrendered upon request
of the local government.

Which suggests someone accused of the common crime of breaking bail who is sheltering in a legation should be surrendered.

It doesn't say anything about withdrawing asylum though.