When loading TIFF files using the standard SCIFIO Context (which does not include ImageJ services), SCIFIO needs the list of Codec objects, which triggers a call to ObjectIndex.get(Codec.class), which attempts to resolve all pending objects. More specifically, in our setting this includes all net.imagej.tool.Tool plugins, many of which rely on ImageJ-specific services not present in a SCIFIO-only Context.