"URLDecoder: Illegal hex characters in escape (%) pattern" in BRMS/RHDM

Issue

• I get the following error after migrating rules from BRMS 6.2.2 to 6.4.9

10:20:38,997 ERROR [org.kie.workbench.common.services.backend.builder.core.Builder] (Thread-129) URLDecoder: Illegal hex characters in escape (%) pattern - For input string: " o": java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern - For input string: " o"
    at java.net.URLDecoder.decode(URLDecoder.java:194)
    at org.drools.compiler.compiler.io.memory.MemoryFileSystem.decode(MemoryFileSystem.java:578)
    at org.drools.compiler.compiler.io.memory.MemoryFileSystem.getFile(MemoryFileSystem.java:107)
    at org.drools.compiler.compiler.io.memory.MemoryFileSystem.getBytes(MemoryFileSystem.java:361)
    at org.drools.compiler.kie.builder.impl.KieBuilderImpl.copySourceToTarget(KieBuilderImpl.java:390)
    at org.drools.compiler.kie.builder.impl.KieBuilderImpl.addKBaseFilesToTrg(KieBuilderImpl.java:381)
    at org.drools.compiler.kie.builder.impl.KieBuilderImpl.addKBasesFilesToTrg(KieBuilderImpl.java:373)
    at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:252)
    at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:238)
    at org.kie.workbench.common.services.backend.builder.core.Builder.build(Builder.java:217)
    at org.kie.workbench.common.services.backend.builder.core.BuildHelper.build(BuildHelper.java:92)
    at org.kie.workbench.common.services.backend.builder.core.BuildHelper$Proxy$_$$_WeldClientProxy.build(Unknown Source)
    at org.kie.workbench.common.services.backend.builder.ala.LocalBuildExecConfigExecutor.apply(LocalBuildExecConfigExecutor.java:64)
    at org.kie.workbench.common.services.backend.builder.ala.LocalBuildExecConfigExecutor.apply(LocalBuildExecConfigExecutor.java:32)
    at org.kie.workbench.common.services.backend.builder.ala.LocalBuildExecConfigExecutor$Proxy$_$$_WeldClientProxy.apply(Unknown Source)
    at org.guvnor.ala.pipeline.execution.PipelineExecutor.lambda$continuePipeline$0(PipelineExecutor.java:109)
    at org.guvnor.ala.pipeline.StageUtil$1.execute(StageUtil.java:38)
    at org.guvnor.ala.pipeline.StageUtil$1.execute(StageUtil.java:33)
    at org.guvnor.ala.pipeline.execution.PipelineExecutor.continuePipeline(PipelineExecutor.java:94)
    at org.guvnor.ala.pipeline.execution.PipelineExecutor.execute(PipelineExecutor.java:76)
    at org.kie.workbench.common.services.backend.builder.ala.BuildPipelineInvoker.invokeLocalBuildPipeLine(BuildPipelineInvoker.java:84)
    at org.kie.workbench.common.services.backend.builder.ala.BuildPipelineInvoker$Proxy$_$$_WeldClientProxy.invokeLocalBuildPipeLine(Unknown Source)
    at org.kie.workbench.common.services.backend.builder.service.BuildServiceHelper.invokeLocalBuildPipeLine(BuildServiceHelper.java:152)
    at org.kie.workbench.common.services.backend.builder.service.BuildServiceHelper.localBuild(BuildServiceHelper.java:83)
    at org.kie.workbench.common.services.backend.builder.service.BuildServiceHelper$Proxy$_$$_WeldClientProxy.localBuild(Unknown Source)
    at org.kie.workbench.common.services.backend.builder.service.BuildServiceImpl.build(BuildServiceImpl.java:67)
    at org.kie.workbench.common.services.backend.builder.service.BuildServiceImpl$Proxy$_$$_WeldClientProxy.build(Unknown Source)
    at org.kie.workbench.common.services.backend.builder.service.BuildInfoService.getBuildInfo(BuildInfoService.java:60)
    at org.kie.workbench.common.services.backend.builder.service.BuildInfoService$Proxy$_$$_WeldClientProxy.getBuildInfo(Unknown Source)
    at org.kie.workbench.common.services.datamodel.backend.server.cache.LRUProjectDataModelOracleCache.makeProjectOracle(LRUProjectDataModelOracleCache.java:81)
    at org.kie.workbench.common.services.datamodel.backend.server.cache.LRUProjectDataModelOracleCache.assertProjectDataModelOracle(LRUProjectDataModelOracleCache.java:72)
    at org.kie.workbench.common.services.datamodel.backend.server.cache.LRUProjectDataModelOracleCache$Proxy$_$$_WeldClientProxy.assertProjectDataModelOracle(Unknown Source)
    at org.kie.workbench.common.services.datamodel.backend.server.DataModelServiceImpl.getProjectDataModel(DataModelServiceImpl.java:91)
    ...