Testcases with Reacting Parcels Fail ('constantVolume' or 'volumeUpdateMethod' must be provided)

In the current develop branch (1d544540), many tutorial cases with reacting parcels fail. For example:

cd $FOAM_TUTORIALS/combustion/fireFoam/LES/smallPoolFire2D/
./Allrun

cd /work/fh2-project-devel/np4075/commit_Bilger_2006/openfoam-com/tutorials/lagrangian/reactingParcelFoam/counterFlowFlame2DLTS/
blockMesh
reactingParcelFoam

will both yield

--> FOAM FATAL ERROR: (openfoam-2010 patch=201012)
Either 'constantVolume' or 'volumeUpdateMethod'
 must be provided.
 The new keyword is 'volumeUpdateMethod'.
 Available methods are  :
 constantRho, constantVolume or updateRhoAndVol.
 'constantVolume' is either true/false

Adding the following entry in constant/reactingCloud1Properties fixes the problem.

constantProperties
{
    constantVolume true;
}

In version v2006, the cases work fine. The problem seems to originate from commit 11d17fec, more specifically here: https://develop.openfoam.com/Development/openfoam/-/blob/develop/src/lagrangian/intermediate/parcels/Templates/ReactingParcel/ReactingParcelI.H#L73

The constructor of constantProperties always requires a value to be specified, regardless if the particles are active or not.