"Item has already been added" error in Experience Editor mode and custom parameters

[Amir818]

Glass.Mapper.Sc version 5.6.160.0 running on Sitecore 9.2.

If you have a markup similar to this (in this case, used for dynamic lazy-loaded images), when the "isEditable" is true, in experience editor, you get the error shown.

@Html.Glass().RenderImage(Model, x => x.RollupLargeImage, new { @Class = "fluid-img", data_srcset = "/sitecore/shell/-/media/experience-explorer/presets/field-320--435.jpg?la=en 1200w, /sitecore/shell/-/media/experience-explorer/presets/field-320--435.jpg?la=en 992w, /sitecore/shell/-/media/experience-explorer/presets/field-320--435.jpg?la=en 576w"}, isEditable: true)

The above is the final rendered url for the parameters. I've shown it that way so that the ?la=en is visible. The original razor markup is this:

@Html.Glass().RenderImage(Model, x => x.RollupLargeImage, new { @Class = "fluid-img", data_srcset = $"{Model.RollupLargeImage.Src} 1200w, {Model.RollupLargeImage.Src} 992w, {Model.RollupLargeImage.Src} 576w" }, isEditable: true)

Item has already been added. Key in dictionary: 'la' Key being added: 'la'

 at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)
   at Sitecore.Pipelines.RenderField.GetImageFieldValue.ConfigureRenderer(RenderFieldArgs args, ImageRenderer imageRenderer)
   at Sitecore.Pipelines.RenderField.GetImageFieldValue.Process(RenderFieldArgs args)
   at (Object , Object )
   at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
   at Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists)
   at Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain)
   at Glass.Mapper.Sc.GlassHtml.MakeEditable[T](Expression`1 field, Expression`1 standardOutput, T model, Object parameters, Context context, Database database, TextWriter writer) in C:\TeamCity\buildAgent\work\9693a2d38f55a4a\Source\Glass.Mapper.Sc\GlassHtml.cs:line 594