[tree] properly copy entry list, also queried indices

[ferdymercury]

This Pull request:

Changes or fixes:

Fixes https://github.com/root-project/root/issues/13338

fyi @romainbqt

Checklist:

• [x] tested changes locally
• [ ] updated the docs (if necessary)

[github-actions[bot]]

Test Results

    19 files      19 suites   3d 8h 38m 15s ⏱️  2 809 tests  2 809 ✅ 0 💤 0 ❌ 51 875 runs  51 875 ✅ 0 💤 0 ❌

Results for commit 87d6950f.