Rollup warning: `this` has been rewritten to `undefined`

Hello! I’ve recently been experimenting with different alternatives to use web components and I found catalyst, which I’ve loved! I tried adding @github/jtml to a component I’m making and I’m getting the following warning when bundling with Rollup:

(!) `this` has been rewritten to `undefined`
https://rollupjs.org/guide/en/#error-this-is-undefined
../../node_modules/.pnpm/@github+template-parts@0.3.3/node_modules/@github/template-parts/lib/attribute-template-part.js
1: var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
                                 ^
2:     if (kind === "m") throw new TypeError("Private method is not writable");
3:     if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
...and 3 other occurrences
../../node_modules/.pnpm/@github+template-parts@0.3.3/node_modules/@github/template-parts/lib/template-instance.js
1: var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
                                 ^
2:     if (kind === "m") throw new TypeError("Private method is not writable");
3:     if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
...and 3 other occurrences
../../node_modules/.pnpm/@github+template-parts@0.3.3/node_modules/@github/template-parts/lib/node-template-part.js
1: var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
                                 ^
2:     if (kind === "m") throw new TypeError("Private method is not writable");
3:     if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
...and 3 other occurrences

From reading the link on the message and seeing the error message contents, this seems to be intentional on your side, so this might just need to be documented? Setting context to window removes the warning and doesn’t seem to break anything, but I’m not sure if this would be the proper approach.