'noarg' and 'allopen' plugins fail to compile correctly when used together

[dotdat]

Simplified use case:
https://github.com/dotdat/rules_kotlin/tree/example_allopen_with_noarg/examples/plugin/src/allopennoarg

It appears that when both noarg and allopen plugins are introduced, neither of them work.
When running the command:
bazel build examples/plugin/src/allopen_with_noarg:user_is_open_test

The following output is produced:

INFO: Analyzed target //examples/plugin/src/allopennoarg:user_is_open_test (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
ERROR: /home/user/Development/rules_kotlin/examples/plugin/src/allopennoarg/BUILD:48:1: KotlinCompile //examples/plugin/src/allopennoarg:user_is_open_test { kt: 1, java: 0, srcjars: 0 } for k8 failed (Exit 1)
examples/plugin/src/allopennoarg/UserIsOpenTest.kt:5:18: error: this type is final, so it cannot be inherited from
class Subclass : User(UUID.randomUUID(), "[email protected]")
                 ^
Compilation failure: compile phase failed:
/home/user/.cache/bazel/_bazel_user/7eb9b19529baec16e97dbc2b12ec3ade/execroot/io_bazel_rules_kotlin/examples/plugin/src/allopennoarg/UserIsOpenTest.kt:5:18: error: this type is final, so it cannot be inherited from
class Subclass : User(UUID.randomUUID(), "[email protected]")
                 ^
Target //examples/plugin/src/allopennoarg:user_is_open_test failed to build
INFO: Elapsed time: 0.226s, Critical Path: 0.13s
INFO: 0 processes.
FAILED: Build did NOT complete successfully

Running bazel run examples/plugin/src/allopen_with_noarg:user_has_noarg_constructor_test results in:

INFO: Analyzed target //examples/plugin/src/allopennoarg:user_has_noarg_constructor_test (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //examples/plugin/src/allopennoarg:user_has_noarg_constructor_test up-to-date:
  bazel-bin/examples/plugin/src/allopennoarg/user_has_noarg_constructor_test.jar
INFO: Elapsed time: 0.120s, Critical Path: 0.00s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action
INFO: Build completed successfully, 1 total action
exec ${PAGER:-/usr/bin/less} "$0" || exit 1
Executing tests from //examples/plugin/src/allopennoarg:user_has_noarg_constructor_test
-----------------------------------------------------------------------------
JUnit4 Test Runner
.E
Time: 0.012
There was 1 failure:
1) userShouldHaveNoargConstructor(plugin.allopennoarg.UserHasNoargConstructorTest)
java.lang.Exception: Expected an empty constructor to exist
        at plugin.allopennoarg.UserHasNoargConstructorTest.userShouldHaveNoargConstructor(UserHasNoargConstructorTest.kt:10)

FAILURES!!!
Tests run: 1,  Failures: 1


BazelTestRunner exiting with a return value of 1
JVM shutdown hooks (if any) will run now.
The JVM will exit once they complete.

-- JVM shutdown starting at 2020-09-23 22:44:24 --

Removing :no_arg_plugin, or :open_for_testing_plugin from the following code succeeds in restoring behavior for the plugin that was not removed.

kt_jvm_library(
    name = "user",
    srcs = ["User.kt"],
    plugins = [
        ":open_for_testing_plugin",
        ":no_arg_plugin"
    ],
    deps = [
        ":open_for_testing",
        ":no_arg_constructor"
    ],
)

Are there any obvious issues here? If not, what can I do to help further?