The Chang-type uB-powerset sealing conjecture

Suppose $\kappa$ is a supercompact cardinal and there is a proper class of inaccessible limits of Woodin cardinals. Suppose $g\subseteq {\operatorname{Col}}(\omega,2^{2^\kappa})$ is $V$-generic. Let

$$\eta_g=(\eta_{{{\sf{uB}}}_g})^{L({{\sf{uB}}}_g,\mathbb{R}_g)}.$$

Then $\operatorname{cf}(\eta_g)=\omega$.

Chang-type uB-powerset sealing conjecture. Moreover, the $\sf{Sealing}$ Theorem holds for $\mathsf{C-uBp}$ in $V[g]$.

Here $\mathsf{C-uBp}=L(\eta^\omega,{{\sf{uBp}}})$ is the Chang-type ${{\sf{uB}}}$-powerset model. The statement is presented under strong large-cardinal hypotheses, and the source gives no explicit resolution status.