==== What is the problem?
When looking up information about System and Composite blocks via the API, it does not return `blockanononly`.
This means, for example, mobile messages always treat them as softblocks, even if they aren't (T259774#6411299).
==== Steps to reproduce problem
1. Create an anonymous system or composite block, e.g.
1. 2 anon. IP block ranges covering the same IP
2. `$wgSoftBlockRanges`, if you have access to the wiki's config.
2. On the blocked IP, visit `/w/api.php?action=query&format=json&formatversion=2&prop=revisions|info&rvprop=content|timestamp&titles=Vnphyyblfr24&intestactions=edit&intestactionsdetail=full` and look at the `blockinfo` array
**Expected behavior:** See `blockanononly` in the array
**Observed behavior:** Don't see `blockanononly` in the array
**Wiki(s):** https://en.wikipedia.beta.wmflabs.org MediaWiki 1.36.0-alpha (0e9937c) 07:48, 31 August 2020.