How accurate is the Top Slicing Relief calculation in a 2019-20 tax return v23.00 update 1

I have a client and for the 2019-20 tax year has £23,000 non chargeable event income and a chargeable event of £97,500 (23 years) the top slicing calculation appears to reduce the amount of personal allowance available.  I was under the impression that after 11 March 2020 the personal allowances remained in full and if I follow the example in HMRC Insurance Policyholder Taxation Manual 3850 I get e figure of Top Slicing Relief approx £2k lower than Sage Taxation v23 Update 1 calculates.  Which impacts on the tax position of the individual.  This case is a deceased taxpayer died in Jan 2020.  My concern is that if I tell the executors tax due is £3,000 and then HMRC recalculate the tax on the gain and say it is £5,000 may well be that the executors will not have the funds to pay the £2,000 as it will have been distributed.

Are Sage 100% certain that the calculation in the software is correct as HMRC advise that the changes implimented 11 March 2020 apply to all gains in the 2019-20 tax year?

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