Change 578404 had a related patch set uploaded (by Gergő Tisza; owner: Gergő Tisza):
[mediawiki/extensions/GrowthExperiments@master] [WIP] Update instrumentation for ORES topics UX changes

https://gerrit.wikimedia.org/r/578404

schema diff

Change 578404 merged by jenkins-bot:
[mediawiki/extensions/GrowthExperiments@master] Update instrumentation for ORES topics UX changes

https://gerrit.wikimedia.org/r/578404

Checked inproduction (testwiki wmf.25) and betalabs eventlogging.

When a user 'Select all' (or 'Remove all') without clicking on 'Done' - the event is still fired, but topics will not have data:

{"dt": "2020-03-25T09:28:37Z", "event": {"action": "se-topicfilter-select-all", "action_data": "taskTypes=copyedit,links;topics=;taskCount=200;isCta=false;topicGroup=science-technology-and-math"

Compare with when 'Select all' was selected and 'Done' was clicked:

{"dt": "2020-03-25T09:29:52Z", "event": {"action": "se-topicfilter-select-all", "action_data": "taskTypes=copyedit,links;topics=biology,chemistry,computers-and-internet,earth-and-environment,engineering,general-science,mathematics,medicine-and-health,physics,technology;taskCount=200;isCta=false;topicGroup=science-technology-and-math"

Below are the examples for illustration only (no issues)
(1) "se-topicfilter-select-all" - User clicks on the "select all" button in the topic filter or the initiation topic dialog.
In the console; "isCta=true" - the button was in the initiation dialog.

{action: "se-topicfilter-select-all", action_data:"isCta=true;topicGroup=geography", user_id: 44486, user_editcount: 2, module: "suggested-edits", …}
action: "se-topicfilter-select-all"
action_data: "isCta=true;topicGroup=geography"
user_id: 44486
user_editcount: 2
module: "suggested-edits"
is_mobile: false
mode: "desktop"
homepage_pageview_token: "iabdtcdk672q3dlu31hdfjhkfb7c2c9d"

(2) "se-topicfilter-remove-all"
"isCta=false" - the button was in the initiation dialog.

{action: "se-topicfilter-remove-all", action_data: "taskTypes=copyedit,links;topics=architecture,art,c…-games;taskCount=0;isCta=false;topicGroup=culture", user_id: 44486, user_editcount: 2, module: "suggested-edits", …}
action: "se-topicfilter-remove-all"
action_data: "taskTypes=copyedit,links;topics=architecture,art,comics-and-anime,entertainment,fashion,literature,music,performing-arts,sports,tv-and-film,video-games;taskCount=0;isCta=false;topicGroup=culture"
user_id: 44486
user_editcount: 2
module: "suggested-edits"
is_mobile: false
mode: "desktop"
homepage_pageview_token: "iabdtcdk672q3dlu31hdfjhkfb7c2c9d"

An example from betalabs eventlogging:

{"dt": "2020-03-25T01:21:41Z", "event": {"action": "se-topicfilter-select-all", "action_data": "taskTypes=copyedit,links;taskCount=200;topics=;isCta=false;topicGroup=history-and-society", "homepage_pageview_token": "epfed7b6p3tlhljme79iro7s095f68a6", "is_mobile": false, "mode": "desktop", "module": "suggested-edits", "state": "activated", "user_editcount": 63, "user_id": 6899}, "ip": "*****", "recvFrom": "deployment-cache-text05.deployment-prep.eqiad.wmflabs", "revision": 19875950, "schema": "HomepageModule", "seqId": 1508566, "userAgent": {"browser_family": "Chrome", "browser_major": "80", "browser_minor": "0", "device_family": "Other", "is_bot": false, "is_mediawiki": false, "os_family": "Mac OS X", "os_major": "10", "os_minor": "10", "wmf_app_version": "-"}, "uuid": "[...]", "webHost": "en.wikipedia.beta.wmflabs.org", "wiki": "enwiki"}