(bug) Can't edit "estimated year" (Request failed with status code 400)

Editing "estimated year" results in "Unable to save data" error message.

From the 400 error returned, it looks like there is a bug in UI.

100% reproducible every time I need to correct the estimated year. E.g. for this person

https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSSM-19GK-S?view=index&action=view&cc=4135959&personArk=%2Fark%3A%2F61903%2F1%3A1%3A6VTD-V993

Since there is no input field for "estimated year" I have to click "+ Add more information" for "Date", delete the current "Estimated Year(1816)" , add new "estimated year". Then the input field appears, where I can enter "1766". Trying to save I get the "Unable to save" error message.

Here's the 400 error

{
"message": "Request failed with status code 400",
"name": "AxiosError",
"stack": "AxiosError: Request failed with status code 400\n at je (https://edge.fscdn.org/assets/static/js/7131.ffe7efc7291469d6.js:2:3072036)\n at XMLHttpRequest.v (https://edge.fscdn.org/assets/static/js/7131.ffe7efc7291469d6.js:2:3076994)\n at pt.request (https://edge.fscdn.org/assets/static/js/7131.ffe7efc7291469d6.js:2:3085239)\n at async It (https://edge.fscdn.org/assets/static/js/main.c1e89536d2db25f0.js:1:449985)\n at async Pt (https://edge.fscdn.org/assets/static/js/main.c1e89536d2db25f0.js:1:448960)\n at async Object.onClick (https://edge.fscdn.org/assets/static/js/main.c1e89536d2db25f0.js:1:654074)",
"config": {
"transitional": {
"silentJSONParsing": true,
"forcedJSONParsing": true,
"clarifyTimeoutError": false
},
"adapter": [
"xhr",
"http",
"fetch"
],
"transformRequest": [
null
],
"transformResponse": [
null
],
"timeout": 0,
"xsrfCookieName": "XSRF-TOKEN",
"xsrfHeaderName": "X-XSRF-TOKEN",
"maxContentLength": -1,
"maxBodyLength": -1,
"env": {},
"headers": {
"Accept": "application/json",
"Content-Type": "application/json",
"FS-User-Agent-Chain": "RIP-shared-image-viewer",
"Accept-Language": "en",
"Authorization": "Bearer p0-zLyR6RmAIqy.IT2pMQTwMnI"
},
"method": "post",
"url": "https://sg30p0.familysearch.org/service/records/volunteer/orchestration/sls/actions",
"data": "{"actions":[{"partitionKey":"3:1:3Q9M-CSSM-19GK-S","id":"4e4420a1-7209-4910-9b73-3d524eb1a2c5","elementType":"FIELD","opCode":"CREATE_ELEMENT","elementArg":{"elementType":"FIELD","partitionKey":"3:1:3Q9M-CSSM-19GK-S","id":"4e4420a1-7209-4910-9b73-3d524eb1a2c5","fieldType":"YEAR_EST","value":{"id":"033f2606-954f-47d7-a515-9ac859cd8d76","origValue":{"text":"1766","attribution":{"comment":"","reasonId":127170,"app":"RII"}}}},"journalAttribution":{"app":"RII"}},{"partitionKey":"3:1:3Q9M-CSSM-19GK-S","id":"4e4420a1-7209-4910-9b73-3d524eb1a2c5","elementType":"FIELD","opCode":"ADD_FV","fieldValueArg":{"id":"033f2606-954f-47d7-a515-9ac859cd8d76","origValue":{"text":"1766","attribution":{"comment":"","reasonId":127170,"app":"RII"}}},"journalAttribution":{"app":"RII"}},{"partitionKey":"3:1:3Q9M-CSSM-19GK-S","id":"f80809ae-c0fc-452c-9396-8b4718c1a0e8","opCode":"ADD_SUB","elementType":"DATE","referenceArg":{"partitionKey":"3:1:3Q9M-CSSM-19GK-S","id":"4e4420a1-7209-4910-9b73-3d524eb1a2c5"},"journalAttribution":{"app":"RII"}}]}",
"signal": {}
},
"code": "ERR_BAD_REQUEST",
"status": 400
}