chart.js 1
chart.js 2
chart.js 3
chart.js 4 (decommisioned)
chart.umd.js 4
chart.umd.js master c0bf05f87df431202c991cfb5f3ee34106d9b6f4

Issue with prototype.js

resources:

2017 mentions conflict with worpress, solved by removal of prototype.js from project Useless note, it is same trace I hit on chartj2 even with prototype.js 1.7
2018 mentions it on jenkinsci-dev group This mentions, update to 1.7.3 is fixing the issue. It did nto worked for me
relevant to above PR to bump jenkins protype.js from 1.7 to 1.7.3. Caused issues, was reverted, afaik jenkins isstill on 1.7
2019 stackoweeflow exact issue (with possible solution)
2020, github issue for chartjs. Not 100% related, by mention security issues and is about same function
One of the few CVEs related to chart.js prototyep polution

chart.js 1 with prototype.js-1.7 loaded - works always

chart.js 2 with prototype.js-1.7 loaded different trace then 3+4

chart.js 3 with prototype.js-1.7 loaded samem issue with all known prototype.js versions

chart.js 4 with prototype.js-1.7 loaded (decommisioned)

chart.umd.js 4 with prototype.js-1.7 loaded same issue with all known prototype.js versions

chart.umd.js master with prototype.js-1.7 loaded c0bf05f87df431202c991cfb5f3ee34106d9b6f4 same issue