fix(plugin): drop hardcoded EngineVersion so plugin loads on 5.7 and 5.8 - #56
Merged
Conversation
…and 5.8
The source .uplugin pinned "EngineVersion": "5.7.0". Under UE 5.8 this
triggers an "incompatible plugin / load anyway?" prompt:
- interactive editor: a modal blocks startup waiting for input;
- -unattended: the prompt auto-answers "No" and the plugin is SKIPPED
entirely (no TCP server, no actions) — so the plugin silently does
not load on 5.8 from source.
Removing the field skips the version-compatibility check, so the plugin
loads cleanly on whatever engine opens it (verified 5.7 and 5.8). This
only affects source / source-zip usage: RunUAT BuildPlugin -Rocket stamps
the building engine's EngineVersion into each precompiled binary zip's
.uplugin, so per-version binary distribution is unchanged.
Verified on a live UE 5.8 editor (dev): plugin mounts, DLL loads, TCP
server starts on :12029, E2E 254/254 pass, in-editor suite 280 pass /
0 errors (the lone failure root-caused to a stale asset left by an
earlier crashed run, not a 5.8 regression).
This was referenced Jun 20, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Problem (found by dev smoke-testing on UE 5.8)
The source
.upluginpinned"EngineVersion": "5.7.0". Under UE 5.8 this triggers an "'UnrealMCPython' is Incompatible — Attempt to load it anyway?" prompt:-unattended: the prompt auto-answers No →LogPluginManager: Skipping load of 'UnrealMCPython'→ no DLL, no TCP server, no actions.So from source, the plugin silently does not load on 5.8. This is the companion fix to #55 (which fixed compilation); #55 alone is not enough to actually run on 5.8.
Fix
Remove the
EngineVersionfield. Without it, UE skips the version-compatibility check and the plugin loads on whatever engine opens it. This only affects source / source-zip usage —RunUAT BuildPlugin -Rocketstamps the building engine'sEngineVersioninto each precompiled binary zip's.uplugin, so per-version binary distribution is unchanged (the 5.8 zip already carries5.8.0).Verification (live UE 5.8 editor on dev)
run_all: 280 pass / 1 fail / 0 errors / 18 skipped — the lone failure (test_create_widget_blueprint) root-caused to a staleMCP_TestWidgetasset left by an earlier crashed headless run; deleting it makes creation succeed. Not a 5.8 regression.is_in_piecrash was an artifact of-run=pythonscript(no LevelEditor viewport) — it passes in the full editor (covered by E2E).